Insulating covering for hot air furnaces



Aug. 22, 1939. c. LENGYEL INSULATING COVERING FOB HOT AIR FURNACES Filed Dec. 2, 1938 2 Sheets-Sheet 1 ENTOR 518a- BY f I: W?)

ATTORNEYS Aug. 22, 1939. c Y L 2,170,085

INSULATING COVERING FOR HOT AIR FURNACES Filed Dec. 2, 1938 2 Sheets-Sheet 2 \NVENTOR ATTORNEYS Patented Aug. 22, 1939 UNITED STATES PATENT OFFICE INSULATING COVERING FOB HOT AIR FURNACES Carl Dengyel, Builalo. N. Y. Application December 2, 1938, Serial No. 243,601 8 Claims. (Cl. 126-114) This invention relates to an insulation covering which is engaged by the upper edge of this shell which is placed around the usual housing of a hot crown.

air furnace for the purpose of conserving heat and In the following description similar characters thereby economizing in the consumption of fuel. of reference indicate like parts in the several fig- One of the objects of this invention is to prourcs of the drawings. vide a covering of this character which is capable The furnace proper which is shown in the of being applied to the standard forms of hot drawings is typical of those now in general use air furnaces now generally used without requirand comprises a lower ash pit 20 which rests on ing any alteration in the construction of the latthe floor of the building, a fire pct 20 arranged ter and also without necessitating dismantling upon the ash pit and containing the usual grate i any parts of the same in order to receive this covfor hard fuel, or burners for oil or gas, a comering. bustion chamber 22 which is arranged above the Another object of this invention is to so confire pot and in which the combustible gases of the struot this covering that the same does not defuel are consumed, and a radiator 23 which surtract from the appearance of the furnace nor mounts the combustion chamber and whereby require more space than is usually necessary for the hot gases are dissipated to the air surroundits accomodation, but instead improves the aping the furnace. pearance of the furnace and is of compact con- In front of the ash pit, fire pot, combustion struction so as to be applicable to furnaces while chamber and radiator is arranged the usual uppermitting them to be installed in the usual right front or wall 24 of the furnace which conamount of space available for that purpose. tains a lower door 25, an intermediate door 26. A further object of this invention is to provide and an upper door ll through which access may a covering of this character which is comparativebe had to the interior of the ash pit, lire pot, comly simple in construction, easily applicable to bustion chamber and radiator for cleaning, fuel furnaces to be insulated and so designed that the feeding, inspecting and repairing. On its trans- 25 same is very durable, efficient in operation and versely opposite and rear sides the furnace is surcapable of being made and installed at relatively rounded by the body portion of a housing or caslow cost. ing which is generally of upright cylindrical form In the accompanying drawings: and comprises a lower sheet metal section 28 Fig. 1 is a front elevation of a hot air furnace which is connected at its lower end with a base 30 q pp w h his imp vement and showing part ring 29 resting on the floor and an upper sheet of he coverin r k n aw y for m re c arly 11- metal section at which is connected at its lower lustratlng certain features of construction. edge with the upper edge of the lower body sec- Fig. 2 is a horizontal section of the same taken tion 28 by a coupling band or ring 3|. The veron line 2-4, of Fig. 1. tical front edges of the lower and upper body F 20 s 'flll y horizvntfll Sect on. 0 sections of the housing engage with the inner an e a Sc e. taken 0 line F sides of the opposite vertical edge portions or F g. 3 is a fragmentary vertical section, on an flanges 32 of the furnace front 2| and are cone a ed S ale, ta en on ine 3-4, F 1- nected therewith by means of bolts 33, as best F g 4 a d 5 are fragmentary horizontal shown in Fig. 4, or by other suitable means. 40 i ns, n an nlar e c l taken n he r- Above the body of the housing is arranged an uprespondingly numbered lines in F wardly tapering housing crown 34 which over- 6 s vertical Section taken on l ne 6- hangs the marginal part of the furnace radiator F 23 and connected at its lower edge with the up- Flg. '7 is a horizontal section taken on line 1--1. per edge of the upper section 30 of the housing by means of a coupling ring or band 35, as shown Fig. 8 is a fragmentary vertical section, on an in Figs. 6 and 3. Over the central part of the enlarged scale. f h upp r part of the furnace radiator of the furnace is arranged a sheet metal housing and h adjacent part of the insulatin housing deck 36 which is preferably of downcovering thereon. wardly dished form and connected at its periph- Fig. 9 is a fragmentary vertical section taken on cry with the upper edge of the crown 34. The line 8-4, Fig. 6. crown and deck of the casing constitute what is E- 10 1S a me tary perspective view of usually known as the bonnet" of the furnace. the crown of the shell forming part of the in- The several members of the furnace housing just sulating covering and also the supporting ring described together with the front 2| form an air chamber 41 between the exterior of the furnace and the housing in which air is raised in temperature for use in heating the building in which the furnace is installed, this air being supplied to the lower part of this air chamber from any available source by means of a. cold air inlet pipe or duct 38 connecting with the lower section of the housing body, while the heated air is withdrawn from the upper part of this air chamber and conducted to the several rooms or spaces which are to be heated by means of conductor or delivery pipes 39 having their inlet portions arranged on an incline and connected with the inclined parts of the conical or tapering housing crown, as best shown in Figs. 6 and 7.

For the purpose of humidifying the air which is heated by the furnace, means are provided which may consist of a. water tank 40 mounted on the lower section 28 of the housing body and having an outwardly projecting portion provided with an opening 4| through which water may be introduced into this tank from the exterior of the furnace while the inner part of this tank projects inwardly into the air chamber and is provided with an outlet opening 42 through which vapor produced by the heating of the water in this tank is conducted into the air chamber for mixture with the air before the latter passes to the compartments which are to be heated.

The smoke and gases are discharged from the radiator by means of a smoke pipe 43 communicating with the rear part of the radiator and extending through an opening in the adjacent part of the upper section 3!) of the housing body and communicating with a smoke stack or chimney in the usual manner.

The insulating covering embodying this invention for preventing radiation of heat from the air in the air chamber through the housing to the atmosphere around the furnace is constructed as follows:

The insulating covering forming the subject of this invention includes a shell which conforms to the contour of the furnace housing and is spaced from the latter so as to form a space or compartment therebetween which receives a thermal insulating material 44 such, for example, as rock wool. In general this outer shell of the covering comprises a lower upright body which is of substantially cylindrical form and surrounds the body of the housing, an intermediate substantially conical or upwardly tapering crown which extends inwardly from the upper end of the shell body around the correspondingly shaped crown of the housing, and an upper deck which extends over the housing deck and is supported upon the upper end of the shell crown. In its preferred construction the body of the shell comprises a lower section 45 of sheet metal which rests at its lower end on the floor of the building and an upper sheet metal section 46 which rests at its lower end on the upper end of the lower section 45 of the shell body. The crown of the shell in the preferred construction consists of a plurality of inclined plates 41 which are arranged in an annular row and each of which is curved concentrically with the axis of the furnace and provided at its lower end with a concentrically curved flange 48 resting on the upper end of the upper section 46 of the shell body while the upper end thereof is provided with an inwardly and downwardly projecting flange 49 so that the last mentioned end of this shell crown plate 41 is of substantially hook form, as best shown in Figs. 6 and 8- In the preferred construction each of these crown plates of the shell has its opposite longitudinal edges converging upwardly so that this plate is of upwardly tapering form and each of these plates has one of its longitudinal edge portions overlapping the adjacent longitudinal edge portion of the next crown plate the row forming the shell crown in the manner of shlnglingt as shown in Fig. '7, thereby producing good joints between these several plates without necessitating absolute accuracy in fitting them together.

The numeral 56 represents a supporting ring which is arranged concentrically with the axis of the furnace and rests at its lower edge upon the housing bonnet at the junction between the upper end of the housing crown and its deck. Each of the crown plates 41 of the covering shell engages its upper hook 49 over the upper edge of the supporting ring 50, thereby holding these parts in a centered position relative to each other and the center of the furnace and also holding these plates spaced from the upwardly tapering crown of the furnace housing. The deck of the covering shell consists of a sheet metal plate 5| having the form of a flat circular disk which is arranged above the deck of the furnace housing and has its peripheral portion resting upon the upper ends of the plates 41 of the covering crown and provided at its periphery with a downwardly inclined annular flange 52 which engages with the outer side of the several crown plates 41, thereby holding the deck of the covering shell against horizontal displacement relative to these crown plates. In order to readily fit the lower and upper flanges 4B and 49 of the crown plates 41 to the curvature of the upper shell section 48 and the ring 50, these flanges are slitted vertically, as shown at 53 and 54 in Fig. 10. and for a similar reason the flange 52 of the covering deck is also slitted vertically, as shown at 55,

to permit this flange to be readily fitted to the outer side of the crown plates 41 without requiring an expensive die operation for this purpose.

Each of the sheet metal sections of the shell body may be connected with the adjacent parts of the housing body sections and the vertical flanges 32 on opposite sides of the furnace front in any suitable manner so as to hold these housing body and shell body sections in spaced relation and also form closures for the front ends of the spaces between these body sections so that the rock wool or other insulating material in this space cannot escape. It is preferable to employ for this purpose two upright Z-bars each of which has its web 56 extending across the space between the front end of the inner housing body and the corresponding shell body while the inner flange 51 of this Z-bar is tucked into the space between the flange 32 of the furnace front and the adjacent part of the furnace housing body and secured to the latter by means of screws 58, the outer flange 59 of this Z-bar being engaged with the innerside of the corresponding end portion of the shell body and secured thereto by means of screws 50, as shown in Fig. 4.

At its lower end the lower shell body section 45 is surrounded on its outer side by a trim band if. A similar trim band 62 surrounds the opposing upper edge portion of the lower section 45 of the shell body and the lower edge portion of the upper section 46 of this body so as to extend across the joint between the same, and the upper edge portion of the upper section 46 of the shell body and the flanges 48 of the crown plates 41 are also surrounded by a trim band 63 which crosses the joint between these last mentioned members, as best shown in Figs. 1 and 6, thereby producing a finish of the shell at these places and also holding the several parts with which they engage in the proper position relative to each other.

The front ends of the lower trim band if and the front ends of the intermediate trim band '2 terminate adjacent to opposite vertical edges of the furnace front 14 and are secured to the outer flanges 59 of the Z-bars by means of screws H. as shown in Figs. 1 and 5. The upper trim band 3, however, extends around the outer side of the upper end of the furnace front I4 but is separated therefrom by a space which equals the width of the furnace front due to the upper trim band 63 being of circular form, as shown in Fig. 2a, while the furnace front M is set back, as shown in Fig. 2, this spacing being indicated at i! in Fig. 3.

The upper trim band 83 is held in place by screws 61 which connect the same with the upper edge portions of the upper sections 46 of the shell body and also by screws 6! which connect this trim band with the upper ends of the angular trim bars 65.

This space 65 is closed across the width of the furnace front 24 by means of a closure bar which is of L-shaped form in cross section and has its lower horizontal portion Ill extending across this space while its upright flange II is secured to the inner side of the adjacent part of the upper trim band 63 by means of screws II, as shown in Figs. 1, 2a and 3. The lower flange II of this closure bar is slitted radially as shown at 13 in order to permit of readily fitting this bar to the space 55 between the upper part of the furnace front 24 and the adjacent front part of the upper band 53.

The corners between the front ends 0 the shell body sections 45. 46 and the Z-bars are covered by L-shape trim bars 66 which are secured to the adjacent front end portions of the shell body sections by means of screws '61.

In order to produce a tight joint between the several plates of the covering crown and also to present a neat and finished appearance on the exterior thereof, the outer surface of these plates is covered by a coating 14 of cement and a finlshed appearance is also imparted to the upper side of the covering deck 5| by coating the same with cement, as shown at 15 in Figs. 6 and 8.

Adjacent to the cold air inlet pipe 3| registering openings l6, 11 are provided in the lower section 45 of the shell body and the thermal insulation for the passage of this pipe, as shown in Fig 6. similar corresponding openings ll, 1! are formed in the shell crown plates and the adjacent part of the insulation N for the reception of the hot air delivery pipes 39, as shown in Figs. 6 and 7, and for a like purpose the upper body section 30 of the furnace housing, the upper body section 46 of the covering shell and the insulation H are provided with allned openings III, II I! to accommodate the smoke pipe 43, as shown in Fig. 2.

In order to render the water tank ll accessible from the exterior of the insulating covering for replenishing the same with water those parts of the lower body section 5 of the covering shell and the adjacent part of the insulation are provided with registering openings which receive a tubular neck 83 through which the outer part of the tank projects, as shown in Flg. 6, the inner side of this neck being lined with a coating I! of cement for sealing the joint between this neck and the respective furnace housing section 18 and protecting this neck from the corrosive effect of any water which may be spilled on the same.

It will now be apparent that the insulating covering for hot air furnaces set forth in the foregoing description will operate very efficiently in preventing radlation of heat from the furnace into the room adjacent to the same where it is not wanted and therefore wasted, and that a considerable saving in fuel is thereby effected. Moreover the construction of the insulating covering is such that the same can be readily applied to furnaces after they have been installed without requiring dismantling of any of its parts for this purpose and that in the finished condition of the covering the same improves the general appearance of the furnace.

I claim as my invention:

1. An insulation covering for a hot air furnace having an upright cylindrical housing body, an upwardly tapering housing crown extending upwardly from the upper edge of the body and a housing deck connected with the upper edge of the crown, said covering comprising an upright cylindrical body shell surrounding the housing body, an upwardly tapering crown shell surrounding the housing crown and a deck shell arranged above the housing deck, a supporting ring interposed between the marginal parts of said decks, and an insulation arranged between said housing and shell members.

2. An insulation covering for a hot air furnace having an upright cylindrical housing body, an

upwardly tapering housing crown extending upwardly from the upper edge of the body and a housing deck connected with the upper edge of the crown, said covering comprising an upright cylindrical body shell surround ng the housing body, an upwardly tapering crown shell surrounding the housing crown and a deck shell arranged above the housing deck, and a thermal insulation between said housing body, crown and deck and said shell body, a crown and deck. said crown shell comprising a plurality of upwardly tapering plates arranged in an annular row and engaging thelr lower and upper ends with the upper edge of sa d body shell and the marginal edge of said deck shell, respectively.

3. An insulation covering for a hot air furnace having an upright cylindrical housing body, an upwardly tapering housing crown extending upwardly from the upper edge of the body and a housing deck connected with the upper edge of the crown, said covering comprising an upright cylindrical body shell surrounding the houslng body, an upwardly tapering crown shell surrounding the housing crown and a deck shell arranged above the housing deck, and a thermal insulation between said housing body, crown and deck and said shell body, crown and deck, said crown shell comprising a plurality of plates which are arranged in an annular row and overlap one another and engage their lower ends with said shell body and their upper ends with said shell deck.

4. An insulation covering for a hot air furnace having an upright cylindrical housing body arranged around the body of the furnace, an upwardly tapering housing crown extending inwardly from the upper end of the housing body over the marginal top part of the furnace and a housing deck extending over the central part of the furnace, said covering comprising an upright cylindrical shell body surrounding the housing body. a supporting ring resting upon the marginal part of said housing deck, an upwardly tapering shell crown surrounding the housing crown and consisting of a plurality of upwardly tapering plates arranged in an annular row and each provided at its lower end with a depending flange resting on the upper edge of the shell body and at its upper end with a downwardly projecting hook which engages over said supporting ring, a, shell deck extending over the housing deck and provided with a marginal downwardly flaring flange which overlaps the upper ends of the shell crown plates, and insulation arranged between said housing and shell members.

5. An insulation covering for a hot air furnace having an upright cylindrical housing body arranged around the body of the furnace, an upwardly tapering housing crown extending inwardly from the upper end of the housing body over the marginal top part of the furnace and amusing deck extending over the central part of the furnace, said covering comprising an upright cylindrical shell body surrounding the housing body, a. supporting ring resting upon the marginal part of said housing deck, an upwardly tapering shell crown surrounding the housing crown and consisting of a plurality of upwardly tapering plates arranged in an annular row and each provided at its lower end with a depending flange resting on the upper edge of the shell body and at its upper end with a downwardly projecting hook which engages over said supporting ring, a shell deck extending over the housing deck and provided with a marginal downwardly flaring flange which overlaps the upper ends of the shell crown plates, insulation arranged between said housing and shell members, and a cement coating applied to the exterior of said shell crown plates and shell deck.

6. An insulation covering for a hot air furnace having an upright cylindrical housing body arranged around the body of the furnace, an upwardly tapering housing crown extending inwardly from the upper end of the housing body over the marginal top part of the furnace and a housing deck extending over the central part of the furnace, said covering comprising an upright cylindrical shell body surrounding the housing body, a supporting ring resting upon the marginal part of said housing deck, an upwardly tapering shell crown surrounding the housing crown and consisting 01' a plurality of upwardly tapering plates arranged in an annular row and each provided at its lower end with a depending flange resting on the upper edge of the shell body and at its upper end with a downwardly projecting hook which engages over said supporting ring, a shell deck extending over the housing deck and provided with a marginal down wardly flaring flange which overlaps the upper ends oi the shell crown plates, insulation arranged between said housing and shell members. and a band surrounding the outer side of said shell body and crown plates and extending across the Joint between the same.

7. An insulation covering for a hot air furnace having an ash pit, a fire pot, a combustion chamber, a radiator, a front, and a sheet metal housing including a body extending around the furnace and connected with opposite edges of said front, a crown having its marginal part engaging with the upper edges of said body and front, and a deck extending over the furnace and engaging with the crown, said covering comprising an upright cylindrical body surrounding the body of the housing and connected with its front spaced edges to opposite upright edges of said front, a shell crown surrounding the housing crown and overhanging the upper part of said front, a band extending around the outer side of said shell body and shell crown and extending across the joint between the same, a bridge plate extending from the upper part of said front to the adjacent part of said shell crown and secured to the adjacent part of said band. and an insulation arranged between said housing and shell members.

8. An insulation covering for a hot air furnace having a sheet metal housing surrounding the furnace and a water tank mounted on the lower part of said housing and projecting laterally therefrom, said covering including a sheet metal body shell surrounding the lower part of said housing and provided with an opening into which said tank projects, a tubular neck surrounding said tank and connected with said housing and shell, an insulation arranged between said housing and shell, and a cement coating applied to the interior of said neck and across the joint between the same and said housing.

CARL LENGYEL.

DISCLAIMER 2,170,085.Oarl Lengyel, Bufi'alo, N. Y.

FURNACES. Patent 1940, by the patentee.

dated August 2 INSULATING: COVERING FOR Ho'r Am 2, 1939. Disclaimer filed February 12,

Hereby enters this disclaimer to the inventions claimed in claims 2, 3, and 8, and that said Letters Patent be read as though claims 2, 3, and 8 were not a part thereof.

[Ofiieial Gazette February 27, 1940.]

tapering shell crown surrounding the housing crown and consisting of a plurality of upwardly tapering plates arranged in an annular row and each provided at its lower end with a depending flange resting on the upper edge of the shell body and at its upper end with a downwardly projecting hook which engages over said supporting ring, a, shell deck extending over the housing deck and provided with a marginal downwardly flaring flange which overlaps the upper ends of the shell crown plates, and insulation arranged between said housing and shell members.

5. An insulation covering for a hot air furnace having an upright cylindrical housing body arranged around the body of the furnace, an upwardly tapering housing crown extending inwardly from the upper end of the housing body over the marginal top part of the furnace and amusing deck extending over the central part of the furnace, said covering comprising an upright cylindrical shell body surrounding the housing body, a. supporting ring resting upon the marginal part of said housing deck, an upwardly tapering shell crown surrounding the housing crown and consisting of a plurality of upwardly tapering plates arranged in an annular row and each provided at its lower end with a depending flange resting on the upper edge of the shell body and at its upper end with a downwardly projecting hook which engages over said supporting ring, a shell deck extending over the housing deck and provided with a marginal downwardly flaring flange which overlaps the upper ends of the shell crown plates, insulation arranged between said housing and shell members, and a cement coating applied to the exterior of said shell crown plates and shell deck.

6. An insulation covering for a hot air furnace having an upright cylindrical housing body arranged around the body of the furnace, an upwardly tapering housing crown extending inwardly from the upper end of the housing body over the marginal top part of the furnace and a housing deck extending over the central part of the furnace, said covering comprising an upright cylindrical shell body surrounding the housing body, a supporting ring resting upon the marginal part of said housing deck, an upwardly tapering shell crown surrounding the housing crown and consisting 01' a plurality of upwardly tapering plates arranged in an annular row and each provided at its lower end with a depending flange resting on the upper edge of the shell body and at its upper end with a downwardly projecting hook which engages over said supporting ring, a shell deck extending over the housing deck and provided with a marginal down wardly flaring flange which overlaps the upper ends oi the shell crown plates, insulation arranged between said housing and shell members. and a band surrounding the outer side of said shell body and crown plates and extending across the Joint between the same.

7. An insulation covering for a hot air furnace having an ash pit, a fire pot, a combustion chamber, a radiator, a front, and a sheet metal housing including a body extending around the furnace and connected with opposite edges of said front, a crown having its marginal part engaging with the upper edges of said body and front, and a deck extending over the furnace and engaging with the crown, said covering comprising an upright cylindrical body surrounding the body of the housing and connected with its front spaced edges to opposite upright edges of said front, a shell crown surrounding the housing crown and overhanging the upper part of said front, a band extending around the outer side of said shell body and shell crown and extending across the joint between the same, a bridge plate extending from the upper part of said front to the adjacent part of said shell crown and secured to the adjacent part of said band. and an insulation arranged between said housing and shell members.

8. An insulation covering for a hot air furnace having a sheet metal housing surrounding the furnace and a water tank mounted on the lower part of said housing and projecting laterally therefrom, said covering including a sheet metal body shell surrounding the lower part of said housing and provided with an opening into which said tank projects, a tubular neck surrounding said tank and connected with said housing and shell, an insulation arranged between said housing and shell, and a cement coating applied to the interior of said neck and across the joint between the same and said housing.

CARL LENGYEL.

DISCLAIMER 2,170,085.Oarl Lengyel, Bufi'alo, N. Y.

FURNACES. Patent 1940, by the patentee.

dated August 2 INSULATING: COVERING FOR Ho'r Am 2, 1939. Disclaimer filed February 12,

Hereby enters this disclaimer to the inventions claimed in claims 2, 3, and 8, and that said Letters Patent be read as though claims 2, 3, and 8 were not a part thereof.

[Ofiieial Gazette February 27, 1940.] 

